How much grass seed do I need per square metre?
To cover one square metre, you need about 34.2 g of grass seed for a new lawn — a typical tall-fescue rate — or about 17.1 g to overseed a thin existing lawn. Across common grass types the new-lawn amount ranges from 7.3 g to 39.1 g.
Grass seed for one m², by grass type
| Grass type | New lawn (grams) | Overseeding (grams) |
|---|---|---|
| Tall Fescue | 34.2 g | 17.1 g |
| Kentucky Bluegrass | 12.2 g | 7.3 g |
| Perennial Ryegrass | 39.1 g | 19.5 g |
| Bermuda | 7.3 g | 4.9 g |
| Generic / mixed | 24.4 g | 12.2 g |
Rates are typical U.S. cooperative-extension ranges (mid-range), applied to 11 sq ft. Your seed bag's label is the authority — read it and adjust, and buy about 5–10% extra for edges and thin spots.
Frequently asked questions
How much grass seed do I need per square metre?
For one square metre, plan on about 34.2 g of grass seed for a new lawn, or about 17.1 g for overseeding, using a typical tall-fescue rate. The exact amount depends on the grass type — across common cool- and warm-season grasses the new-lawn figure ranges from 7.3 g to 39.1 g. Enter your real dimensions in the calculator above to get a number for your specific lawn and seed.
Does the grass type change how much seed I need for one m²?
Grass type changes the seeding rate substantially. Fine, spreading grasses like Kentucky bluegrass need far less than bunch grasses. For one m², a new lawn needs about 12.2 g of Kentucky bluegrass but about 39.1 g of perennial ryegrass. The table on this page lists every common grass type so you can match your seed bag.
How is the grass seed amount for one m² calculated?
Seed is applied at a rate in pounds per 1,000 square feet, so pounds = rate × (area ÷ 1,000). This page works from a one square metre basis, using the mid-range tall-fescue rate of 7 lb per 1,000 sq ft for a new lawn and 3.5 lb for overseeding. Enter your own dimensions above — in feet, yards or metres — and the calculator does the arithmetic for you. One square yard is 9 square feet and one square metre is 10.76 square feet, so metric measurements are converted before the rate is applied.
Are these seeding rates exact?
These seeding rates are typical U.S. cooperative-extension ranges, chosen mid-range and rounded for a planning estimate. Your seed bag's label is the real authority: it gives the exact rate for that blend and whether it is a new-lawn or overseeding rate. Always read the bag and adjust, and buy about 5–10% extra for edges and thin spots.
Grass seed for other sizes
For 1,000 sq ftFor 1 acreFor 2 acresFor ½ acreFor 100 m²Per square footTo overseed New lawn vs overseeding Full calculator →